Final Exam 2 (20%)

Question

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

Answer 1

Hidden content!
  ***  ********* * **
***   * *   *  * ***

int main()
{
  *   * *     char  * *  
 ** *     *   *** int i,c=0;
*******  **  *  * **     * * * * * ****   ** * 
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*  ***** *      ****** *  ***   *  
** * ** ***  *  {
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***  * * **  *  **  **   ** *   {
 * * * * *  *   ** *  *  * * ****  ** ** *     ***  ** **  *   *** *   * 
**  **  **  **  * ****  ******    * *         * ***    *   ** *** {
***** *                ** * *   ** *  c=0;
**    *     ******    * **  *  * * **          * *  *  ** * *    * ** }
 **  *  *   ***  **       ****  *****   * *    else  *  ***    ** ****** ***
***** ** * *  **** * * ** *       * ********   *   *   * ** *** {
*** * * *    *      *  *  *   ** *  *** ****  *     **  *  *  * *  * *   c++;
   ***   ***** * *  *   ** * **   *** *  **       ** ** }
   * *  **  * * **** *    * * * * }
* ****   * ** ** 
     *  * ** if(c==0)
****  ** *   *  **  *** ****    *  **  *  *    is not a prefix of  ** *  * **
*****  ***** else
  *** *** * ** ** * ** *** **  *** ** *     is a prefix of * * * *     
    *  * ***   ** }
     ** ** *  return 0;
}

Comments

prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
   *  ** *   **    *
*  * * *     **  ***  *
int main()
{
   *  * * *     ap;
   *  *****  *   * ** ** * *  * * *   *** * ** *  || ap=a)
*    *      ** ** *        **  **    is a prefix of abcde\n");
 *    *  *** **
 * *  *  ** **  
 ** ** * **   *******      * *   ***  ** ** * is not a prefix of abcde");
*     *       ***   *  ***** *   ***   *   ** ** *    * * * * *     0;
   * ***** **  *    **  *  *   **   *  **  * ***    *** *    ***** ** ****  *
  

Comments

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

Answer 3

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*****  *  **  ** 
  *  *** ** * *  * ***

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
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* *  * *   *     ******   * **** ***  * **  *  ** **   * **  
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* *   *   * *** *   **** *   ***   * ***  * * ***   **   ** 
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}


int main()
{
* **  *** *   *
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 ***    * **  * *   * 
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sl=strlen(s);
pl=strlen(p);


  *  ***   ***  && pl<sl)
{

 * *   *   *  **    **    *    ***  *  * *** is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}

Comments

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 4

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
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    int l,i;
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    {
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* ****  **   *** ** *   *  *  *** * **    **     *
** *  *   * ***  * ** *   * ***  * **   *     ***    ***   *********  * *  ** ***    **  ****   a prefix of %s",a,b);
*   *     * *  *   * *** * **  * * **  *** *****  * * *   **   *   *****
*   * *     *   *   *  * *         *  * * ***  ** * * *
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 **  *  **** **  ***    *  **  ** *  * **** ** *  ***
*    **  *  * **** ***  ** *    *** **  *******   *      *  ***** * ** **    **  * * ** *  * **** * not a prefix of %s",a,b);
****   **  * *     **  **  * ** *    *  * **  **   * ***   *    **  **  ** **** 
 **   *** * *** *** *   *   ***** *  *** ***  **  * *  
    }


}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 5

Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
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**** * *   *    **   **** * count=0;
  * **** *  **   ***  *  len;

* ***    *** **   * **** * *  *** *** *

***  * * **   ** ****** *  ****  ***  *** ** *
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**** * * **    ** *** ** ****  *    *  ***  *  * **** * ****
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*** ** * *  **     **   *  


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**  *   ** ****    * ** 
***  ** ****  **** *** * **  *  ****   * ** *  **   *           1;
*    * **** * ****   * 
*  **  * *   *** ** * *****    

   return 0;
}


int main()
{
***   ** ** *   ***  * *  * **** a[100];
 ***  ******    *** * ******* b[100];


 * ******** * ** * ****  ***  ***** ** ** ***** * *  **  * * *   
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**    **  **   * **     *  * ** ***  **

* *  ****  ***  *   **  * ***** **  

 {
**  ***  *     ** *  * **  ** *** ****   *   ***   * *  ** * * *** *** is a prefix of %s",a,b);
   **** *** ****** *    * ** **  *
  * **  ******  *  *** **        **
*   * ** ** *  *** * *  * 
    *  * * *     *    **   * ***  ** ** *   ****  *  ***  *   ****  **  * is not a prefix of %s",a,b);
******    ** * ***   **  * 


 *   *   **  **** **   * *****  0;
}

Comments

prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 6

Hidden content!
***     *  ***  *  *
*      ****  **      *

int  *   *
{
** * **  *   * **   *** *      *  ** no idea, I   * even do it in the  **        ******
  *** *  ****** *  **  ***   ** 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 7

Hidden content!
#include      *  **   * 
#include   * **  *  ** *
#include *     *   *   **  

int pref(char[],char[]);

int main(){

  ** **   * *   ***    p[10],s[10];
** *  *    * ***  ** * * **    num;

 * * * * **  * *    * *   *   ** **
     ****     ****** *  *****  ** 
* *    * *     *  * ***  *   * *    *    *** *    **** * *
 **  *  *  **    *   *  *  ** * **   * * *    ** 

** * * ******  ***  ** * = pref(p,s);

 *  ** * * ** ******  ** **** * *   
 **** *   * * ** ** *   ***   ******  ****   ********* *  *** *   * **  * is a prefix of %s",p,s);
**   * *   ******  *   * ** *** *  **
***  *   * *  * *   *  *  ***** ****    *  ***** * * **  *    is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
** ** ***** *****  **  * *** i;

 ** *** * * * * ** * *     *       *   * * *  
 *****  * * * * *   *** * * ** * *   *** **    ***  *  ** ******** ***  * * **     ***  *  *  * ***   *  *  **** **
 **   ** *   **   ***  *****  **  ***  * ** *  ***  ****  **  **   * * **** ****     ** **  *   ** **    is a prefix of %s",p,s);
 *   ****        * *   *   * * **      * *****
****** ** ***  **  * *  ** *  *** *     * *  *  ** ***  *  * * **********  * *  ***  *  * ** *  **  **** is not a prefix of %s",p,s);

      * * ******  *   *** ***

}

Comments

prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.

---

prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~

---

prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^

Answer 8

Hidden content!
  ******* **   * *    **
* * * **     **  *   * *

int main()
{
    * **    length1,  ** c;
   ** *  a[100];
   ** ****  b[100];
  ****     d[100];

**   *  *   ** **  *  ** ****    * ** *
 * **  ** *  *  *  **  *  * * 

*  * *  ***    * *    *

** ** *      *  *

****   ***   *  * *  * 
 *****  *
*      *** ** **     * * * ***   is a prefix of * * **  * **  
 ***** *
* * *   *   ****  
 ***    *
 * *  *   ***** * * * is not a prefix of   *  *     **
* *  *  

}

Comments

prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^

Answer 9

Hidden content!
***  * * *  **** ****  ** 
 ** * * **** ** *   *

int main()
{
 ** **  ** *** * ** ** * *   *  str;
   ***** ****  *  * * *  * i, p, s;

  ** ****    *     * *   ** *  *  ***    *  * *  **** &p, &s);

  * *   ***  **  *     * *** *** (i<=0; &p; i++);
 *** ** * *   *** ***** * **   *
 *   ** ***** ***** *** ****   *  *    ** * * *    &p);
 *  *  *   ****  * **  *  * * * ** *** **** * **  
 * ** *            *** **  *
    ***  *   ******** ** 

 ***  *   *    ** **** ***    *  *   0;
}

Comments

prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^

Answer 10

Hidden content!
** *    *  ** ****** 
 * *** ** * **   *****
int main (){
char ** ***
char  * **** **
**  * *     * ***  **  **   
 **  **   ***** ***** *  *** *
       * *   *** ****  ***  * *
 ********** * *  * * * **  * **     
****   **** *** **      *
* * * * ** *   is a prefix of ****  *  *** *    * 
}
else{
 ***** *    * is not a prefix of %s ***  * * *  ******
}
   * 0;
}

Comments

prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^